/*
  将下面异步代码使用 Promise 的方法改进
  尽量用看上去像同步代码的方式
  setTimeout(function () {
    var a = 'hello'
    setTimeout(function () {
      var b = 'lagou'
      setTimeout(function () {
        var c = 'I ♥ U'
        console.log(a + b +c)
      }, 10)
    }, 10)
  }, 10)
*/
function timeOut (value) {
  return new Promise((resolve, reject) => {
     setTimeout(() => {
      resolve(value)
     }, 1011)
  })
}
async function change () {
  let a = await timeOut('hello')
  let b = await timeOut('lagou')
  let c = await timeOut('I ♥ U')
  console.log(`${a} ${b} ${c}`)
} 
change()